Passive Earth · Tree Guardian — keeping street trees alive

Up to a third of newly planted street trees die in North America during establishment.

Municipal crew installing Tree Guardian on a newly planted street tree at the pilot site

Municipal pilots · British Columbia · 2026

More street trees survive. Fewer crew visits.

Young trees need water every 2–3 days. Crews can't be there that often. One Tree Guardian fill covers 7–10 days.

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Pilots & partners· UBC + UNA science pilot (pending)· AGTIV REACH· Foresight Canada

Five weeks in — same site, same watering cycle

Our BC Interior pilot site: 35°C stretches, heavy wind, full sun, no shade. Every tree on the same 7-day cycle. The photos argue for themselves.

Our trees are thriving — a Tree Guardian honey locust holding full canopy.
Tree Guardian tree of the same species at five weeks holding a full green canopy
Tree Guardian, week 5, same site: full green canopy through the same heat and wind.
Control tree on a standard surface bag at five weeks with a thin, sparse canopy
Standard-bag control, week 5: thin and sparse after 35°C heat and heavy wind.
Tree Guardian bur oak with a dense green canopy at four weeks
Tree Guardian bur oak, week 4: dense canopy through the same heat.

Observational photos at four to five weeks post-planting. Measured survival data comes from the municipal pilots now in the ground.

All field results, photos & video →

The gap street trees die in

In some cities, up to a third of newly planted street trees are dead within two years (Nowak et al.) — and the establishment window is when most of that loss happens. Young trees need water every 2–3 days; crews come every week or two, and summers are getting hotter and longer. Tree Guardian closes the gap at planting: a drop-in establishment kit whose bag and wicking irrigation deliver water to the root ball continuously, 7–10 days per fill, while inoculated biochar and mycorrhizal fungi improve the soil it roots into.

Watering guidance: daily for two weeks, every 2–3 days through week 12 (University of Minnesota Extension; municipal policy in Saint Paul). The same guidance notes a standard surface bag empties in 5–9 hours.

How the kit works →
Tree Guardian installed on a newly planted oak
Tree Guardian on a newly planted oak — installed in minutes, at planting.

What that's worth — Vancouver as the worked example

$440Kprojected annual savings at today's 2,000 trees/year
200trees saved per year — a 10-point survival improvement
50%projected reduction in crew watering visits during establishment

Conservative model from public Park Board data and peer-reviewed literature. Explore the savings model →

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The savings model, pilot design and pricing on a single page — built to forward to your urban forestry lead. We’ll email you the PDF and check in once to see if it was useful. We respect your inbox — that’s it.

The pilot: matched controls, sized to your program

Same species, same neighbourhoods, same planting window — survival measured at 12 and 24 months. One avoided failure covers thirteen pilot kits; the conservative model projects a 10-point survival gain.

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